JPH04137251A - Large-and-small cassette storage rack - Google Patents

Abstract

PURPOSE:To correctly store large and small cassettes in a cassette storage part by inhibiting the large cassette from being ejected when inserted even if a small cassette misinsertion detecting means is in a misinsertion detection state. CONSTITUTION:When large cassettes 1 and small cassettes 2 are inserted selectively at mutually different positions in the cassette storage part 3, the correct insertion and misinsertion of those large and small cassettes 1 and 2 are detected by detecting cuts formed in the bottom surfaces of the large and small cassettes 1 and 2 at mutually different positions, and when the misinsertion is detected, the large and small cassettes 1 and 2 are automatically ejected. When the insertion of the large cassette 1 is detected, the large cassette 1 is inhibited from being ejected even if misinsertion detecting means 70a and 70b for the small cassette 20 are in the misinsertion detection state. Consequently, when the large and small cassettes 1 and 2 correctly inserted at the mutually different positions, those large and small cassettes 1 and 2 can correctly be stored in the cassette storage part 3.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example 01 Overall description of force set auto changer (Fig. 12) 02 Explanation of the small cassette guide and eject means of the storage shelf for large and small cassettes (Figures 9A to 11B) G. Description of the drive mechanism of the small cassette guide of the storage shelf for large and small cassettes (Figures 6 to 8) G4 Large and small Explanation of the drive mechanism of the ejecting means of the cassette storage shelf (Figures 2A to 2E) Description of the incorrect insertion detection mechanism for large and small cassettes of the 05 large and small cassette storage shelf (Figures 1A to 5C) G6 Large and small cassette storage shelf Explanation of the means for switching the storage shelf to a shelf exclusively for large drawers (Fig. 2F, Fig. 2G, Fig. 4D, Fig. 4E) The present invention relates to a storage shelf for storing large and small cassettes, which is ideal for application to a cassette autochanger that performs continuous video playback and recording over a long period of time.

B. Summary of the Invention Claim 1 of the present invention is a storage rack for both large and small cassettes applied to a cassette autochanger, etc., in which a large cassette and a small cassette are selectively inserted into different positions in the cassette storage section. By detecting the presence or absence of notches on the bottom surfaces of these large and small cassettes whose positions are shifted from each other, correct insertion and incorrect insertion of these large and small cassettes is detected, and the large and small cassettes are automatically ejected when they are incorrectly inserted. In this case, when it is detected that a large cassette has been inserted, even if the small cassette erroneous insertion detection means is in the erroneous insertion detection state, the large cassette is not ejected. When the cassettes are correctly inserted into different positions, these large and small cassettes can be correctly stored in the cassette storage section.

Claim 2 of the present invention is such that the small cassette erroneous insertion detection means of the large and small cassette storage shelf of claim 1 can be easily switched to an inoperable state, so that the large and small cassette storage shelf can be easily switched to an inoperable state. It can also be used as a dedicated storage shelf.

C. Prior Art The applicant of the present invention previously filed an application for a cassette storage shelf for a cassette autochanger using video cassettes, for example, as described in the specification and drawings of Japanese Patent Application No. 61-83566. ing.

In this prior application, cassettes of one size are inserted into the cassette storage section, and the inserted cassette moves forward from the backward movement position to the forward movement position against the backward movement biasing means. a locking means for locking the ejecting means in a forward position; and an incorrect insertion detection means for detecting correct or incorrect insertion of a cassette by detecting the presence or absence of a notch in the bottom of the inserted cassette. have,
When a cassette is incorrectly inserted into the cassette storage section, the locking means prevents the ejecting means from locking, and the ejecting means and the double biasing means automatically eject the cassette. This is to make the operator aware of this.

D Problems to be Solved by the Invention However, in a storage shelf that can be used for both large and small cassettes, in which large and small cassettes are selectively stored in the cassette storage part, it is difficult to store the large cassettes and small cassettes in different locations in the cassette storage part. If the cassette is inserted into the same position, the notches on the bottoms of the inserted large cassette and small cassette will also be shifted from each other.

Therefore, if a pair of erroneous insertion detection means is provided to detect the presence or absence of the notch on the bottom surface of the large and small cassettes whose positions are shifted from each other, there will be no problem in detecting the erroneous insertion of the small cassette, but if the large cassette is inserted When this occurs, the erroneous insertion detection means of the small cassette is pressed into the erroneous insertion detection state by the bottom surface of the large cassette.

As a result, even though the large power cent is correctly inserted, the erroneous insertion detection means for the small cassette enters the erroneous insertion detection state, resulting in a problem that the device is not practical.

Claim 1 of the present invention provides a storage shelf for storing large and small power cents selectively in a cassette storage section, in which a large power cent and a small power cent are selectively stored, and when a large power cent is inserted, erroneous insertion of a small power cent is detected. It is an object of the present invention to provide a device which does not perform a large force eject operation even when the means is in a state of detecting erroneous insertion.

It is an object of the second aspect of the present invention to provide a storage rack for large and small cents in which the erroneous insertion detection means for small cassettes can be easily switched to an inoperable state.

E. Means for Solving the Problems In order to achieve the above object, the storage shelf for large and small cassettes according to claim 1 of the present invention has a large cassette and a small cassette that are selectively inserted into different positions in the cassette storage section. a pair of eject means that are moved back and forth from a backward movement position to a forward movement position by resisting the backward movement biasing means; a locking means that locks the pair of ejection means in the forward movement position; Correct and incorrect insertion of the large cassette and small cassette can be detected by detecting the presence or absence of notches on the bottoms of the large and small cassettes, which are selectively inserted into different positions. a pair of erroneous insertion detection means that enables the locking operation of the locking means when insertion is detected, and prohibits the locking operation of the locking means when erroneous insertion is detected; and a large force cent detection means that enables the locking means to perform a locking operation even when the small force cent erroneous insertion detection means is in the erroneous insertion detection state.

Claim 2 of the present invention provides that the storage shelf for large and small cassettes according to claim 1 is operated by a front panel forming a cassette insertion opening of the power center storage section, and the erroneous insertion detection means for the small cassette is set in an inoperable state. The device is equipped with a switching means for switching to.

F. Function The storage shelf for both large and small cassettes according to claim 1 configured as described above is such that the large and small cassettes are selectively stored in the cassette storage part. When inserted, the small skein 7
) Even if the erroneous insertion detection means is in the erroneous insertion detection state, the ejecting means can be locked, so that the ejecting operation with a large force can be prevented despite the erroneous insertion detection state.

In the storage shelf for both large and small cassettes according to the second aspect of the present invention, the means for detecting erroneous insertion of small cassettes in the storage shelf for large and small cassettes can be easily switched to an inoperable state by attaching the front panel.

G. Embodiment Hereinafter, an embodiment in which the present invention is applied to a cassette autochanger using a video cassette will be described with reference to the drawings.

G. First, the entire cassette autochanger will be explained with reference to FIG.

First, this cassette autochanger is capable of selectively using two types of cassettes, a large cassette 1 and a small cassette 2, which are different in size. The front and rear shelf blocks have two front and rear rows of large and small cassette storage shelves 3 that can selectively store large and small cassettes 1 and 2, and are arranged in multiple rows on the left and right in multiple stages above and below. 4.5 is provided. A cassette transfer machine 6 disposed between the front and rear shelf blocks 4 is configured to be movable vertically and horizontally.
Recording and reproducing devices 7 are arranged in multiple stages above and below beside the moving route. Note that the cassette transfer device 6 can selectively transfer the large cassette 1 and the small cassette 2, and each recording and reproducing device 7 can selectively record and/or reproduce the large cassette 1 and the small cassette 2. It consists of a front-loading VTR that can be used to

The predetermined storage shelf 3 of the front shelf block 4 is configured as a shelf exclusively for taking in cassettes, and a cassette insertion slot 9 is provided on the operator side 8, which is the front side.
A cassette outlet 11 is provided on the cassette transfer machine side 10 which is the rear side.
is provided.

In addition, the other storage shelves 3 for large and small cassettes in the front shelf block 4 are provided with a cassette entrance 12 on the cassette transfer machine side 10 that is the rear side, and all the storage shelves 3 for large and small cassettes in the rear shelf block 5 are provided with a cassette entrance 12. A cassette inlet/outlet 12 is provided on the front side of the cassette transfer machine.

Next, the operation of this cassette autochanger will be explained.

First, when loading large and small cassettes 1 and 2, the operator inserts the large and small cassettes into the large and small cassette storage shelf 3 dedicated to cassette loading from the cassette insertion slot 9, and sequentially inserts the large and small cassettes into the large and small cassettes 1.
Insert in the direction. The inserted large and small cassettes 1.2 are automatically sent out sequentially in the direction of the arrow from the cassette delivery port 11 and received by the cassette transfer machine 6. During this time, the barcodes of the large and small cassettes 1 are read by a barcode reader (none of which is shown). Thereafter, the large and small cassettes 1.2 are sequentially transferred by the cassette transfer device 6 to the large and small cassette storage shelves 3 at designated shelf addresses, and are respectively inserted and stored in the direction of arrow C through the cassette entrance/exit 12.

Next, at the time of broadcasting, large and small cassettes 1.2 are transferred from the large and small cassette storage shelf 3 of the designated shelf address to the cassette transfer machine 6.
The cassette is selectively taken out in the direction of the arrow C', transferred to the designated recording/reproducing device 7 by the cassette transfer device 6, and automatically inserted in the direction of the arrow d for recording or reproduction. The large and small cassettes l and 2 discharged from the recording and reproducing device 7 in the direction of the arrow d' after recording or playback are received by the cassette transfer device 6 and then stored in the storage shelf at the original shelf address for both large and small cassettes. 3 will be automatically returned.

By repeating the above operations continuously,
It is possible to perform continuous video playback and recording over a long period of time.

Moreover, at this time, the small cassette 2, which is small in size and has a short recording time, is used to broadcast short-time programs such as commercials, and the large cassette 1, which is large in size and has a long recording time, is used to broadcast news, various programs, etc. It is possible to adopt a system that distinguishes the length of the broadcast time, etc. by the size of the large and small cassettes 1.2, so that long-duration programs can be broadcast.

G2 Next, the small cassette guide and eject means of the storage shelf 3 dedicated to taking in cassettes will be explained with reference to FIGS. 9A to 11B.

First, barcode labels 15a and 15b on which barcodes 14a and 14b are printed are pasted on one side 1a and 2a of the large and small cassette 1.2, and on the other side 1.
An opening/closing lid IC12C is attached to b and 2b. Then, the barcodes 14a and 14b of the large and small cassettes 1.2
The barcode reader 16 that reads the cassette transfer machine 10
installed on.

Next, the large and small cassette storage shelf 3 has a shelf plate 1 formed of synthetic resin or the like on the top of a shelf chassis 18 made of sheet metal.
9 is installed horizontally. Then, the shelf board 19 and the shelf chassis 18 of the storage shelf 3 for both large and small cassettes arranged on the upper part.
A cassette storage section 20 is formed between the cassette storage section 20, a cassette insertion port 9 is provided on the operator side 8 of the cassette storage section 20, and a cassette delivery port 11 is provided on the cassette transfer device side 10. Then, the large and small cassettes 1.2 are selectively inserted into the cassette storage section 20 from the cassette insertion opening 9 in the direction of the arrow a in their longitudinal direction.

Next, a pair of inner walls 21a and 21b are placed on both left and right ends of the shelf board 19 to guide both left and right sides 1a and 1b of the large cassette 1.
are integrally molded.

Also, on the shelf board 19, both left and right sides 2a of the small cassette 2,
A small cassette guide 22, which is approximately in the shape of a band plate, is arranged parallel to the inner wall 21a to guide the cassette 2b between the inner wall 21a and the inner wall 21a. This small cassette guide 22 is mounted on the shelf chassis 18 so as to be rotatable in the vertical directions of arrows e and e' about a fulcrum shaft 23, and is mounted on the shelf board 19 as shown in FIG. 11B. The cassette storage section 20 is inserted through the elongated hole 25.
It is configured to be movable in the directions of arrows e and e' between the position where it is inserted into the cassette storage section 20 and the position where it is released from the inside of the cassette storage section 20 below the shelf board 19 as shown in FIG. 11A. There is. Note that tapered surfaces 2 are provided at both front and rear ends of a guide surface 22a that faces parallel to the inner wall 21a of the small force center guide 22.
2b and 22c are provided.

Next, large cassette detection rollers 24a and 24b, which are a pair of left and right large cassette detection means, are provided on both sides of the cassette insertion port 9 side of the cassette storage section 20.
A large cassette detecting roller 24 interlocked with a large cassette detecting roller 24b is located at an example part on the cassette outlet 1] side of 0.
c is provided. Note that these detection rollers 24a
, 24b, and 24c are inserted into the cassette storage section 20 through the notches 26a, 26b, and 26c provided in the side inner wall 21a, and at a position where they are laterally escaped from the inside of the cassette/gutter storage section 20. It is configured to be movable in the directions of arrows f and f', which are the left and right directions.

In the cassette storage section 20, on the shelf board 19, there are provided ejecting means 27a, 27b for the large and small cassettes 1.2, and a feeding means 28 for the large and small cassettes 1.2.

Next, this small cassette guide 22 and eject means 2
The operations of 7a and 27b will be explained.

First, before the cassette is inserted, the large cassette detection rollers 24a, 24b, and 24c are inserted into the cassette storage section 20 in the direction of arrow f as shown in FIG. 9A, and the small cassette guide 22 is inserted in the direction of the arrow f as shown in FIG. 11B. As shown, it is inserted into the cassette storage section 20 in the direction of arrow e.

Therefore, as shown by solid lines in FIGS. 9B, 10E3, and 11B, the small cassette 2 is inserted from the cassette insertion opening 9 into the inner wall 21a of the cassette storage section 20 and into the small cassette guide 2.
2 in the direction of arrow a.

At this time, one side surface 2a of the small cassette 2 causes one of the high-force cent detection rollers 24a to escape outside the cassette storage section 20 in the direction of arrow f', but the small cassette guide 22 moves into the cassette storage section as shown in FIG. 11B. It is kept as it is within 20.

Therefore, the guide surface 22a of the small cassette guide 22 reliably guides the side surface 2b of the small cassette 2.

At this time, the front end surface 2d of the small cassette 2 pushes the ejecting means 27b in the direction of arrow a, and the small force center 2 is inserted into the cassette storage portion 20 to the proper position shown by the solid line in FIGS. 9B and 10A. By the way, the eject means 27
At approximately the same time that b is opened and the small cassette 2 is stomped, the delivery means 28 moves in the direction of arrow g from the disengaged position shown by the dashed dot line to the locked position shown by the solid line in FIG. 10A. and is engaged with the rear end surface 2e of the small cassette 2.

Next, the large and small cassette storage rack 3 is operated by the operating means of the cassette/groove transfer device 6, and the ejecting means 27b is ejected in the h direction from the engaged position indicated by the solid line to the disengaged position indicated by the dashed-dotted line in FIG. 10A. At the same time, the small cassette 2 is delivered to the cassette storage section 20 by the sending means 28 as shown in FIG. 9C.
The cassette is delivered from the cassette delivery port 11 into the cassette transfer machine 6 in the direction of the arrow. In addition, this sent out small cassette 2
is received in the cassette transfer device 6 by a conveyor belt (not shown) of the cassette transfer device 6.

At this time, the barcode 1 on the side surface 2a of the small cassette 2
4b is automatically read by the barcode reader 16, and the number and contents of the small cassette 2 are detected.

Next, as shown by dashed lines and solid lines in FIGS. 9B, 10B, and 11A, the large cassette 1 is inserted through the cassette insertion slot 9 into the pair of inner walls 21a, 21 in the cassette storage section 20.
Insert in the direction of arrow a between spaces b.

At this time, since the pair of large cassette detectors 24a and 24b are both escaped from the cassette storage section 20 in the direction of arrow f' by both side surfaces 1a and 1b of the large cassette 10, the small cassette guide 22 moves as shown in FIG. 11A. The cassette housing 20 is automatically released in the direction of the arrow e, and the ejecting means 27b is also automatically released in the direction of the arrow from the engaged position indicated by the solid line to the non-engaged position indicated by the dashed-dotted line in FIG. 10B.

Therefore, the small cassette guide 22 and the ejecting means 27
b does not become an obstacle to insertion, and the large cassette 1 can be smoothly inserted into the cassette storage part 20.

Also, at this time, the front end surface 1d of the large cassette 1 pushes the ejecting means 27a in the direction of arrow a, and the large cassette 1 moves to the cassette 7).
When the large cassette 1 is inserted into the storage portion 20 to the correct position shown by the dashed line in FIGS. 9B and 10A, the ejecting means 27a is locked and the large cassette 1 is ejected almost at the same time as the insertion is stopped. Means 28 is 1 in FIG. 10A.
It is moved in the direction of arrow g from the non-engaged position indicated by the dotted chain line to the engaged position indicated by the solid line, and engaged with the rear end surface 1e of the large cassette 1.

Next, the large and small cassette storage rack 3 is operated by the operating means of the cassette transfer device 6, and the ejecting means 27a is ejected from the locking position shown by the solid line in FIG. 10A to the non-engaging position shown by the dashed line. As shown in Figure 9C, the sending means 2
Depending on the day, the large cassette 2 is delivered from the cassette delivery port 11 of the cassette storage section 20 into the cassette transfer device 6 in the direction indicated by the arrow. Then, the large cassette 1 is received by the conveyor belt of the cassette transfer device 6 in the same way as the small cassette 2.

At this time, the barcode 1 on the side surface 1a of the large cassette 1
4a is automatically read by the code reader 16, and the number, contents, etc. of the large cassette 1 are detected.

Next, as shown in FIGS. 9D and 10A, the large and small cassettes 1.2 are transferred from the cassette transfer device 6 to the cassette outlet 11.
When returning the large and small cassettes 1.2 to the cassette storage section 20 in the direction of arrow b' through the cassette storage section 20, the large and small cassettes 1.2 are accurately returned to their respective positions within the cassette storage section 20 by the conveyor belt and push arm 64 of the cassette transfer device 6. Ru. Therefore,
The small cassette 2 can be inserted accurately between one inner wall 21a and the small cassette guide 22 in the direction of arrow b'. Also, at this time, the eject means 27a, 2
7b is moved in the direction of arrow a and locked, and when the large cassette detection roller 24c is released in the direction of arrow f' due to insertion of the large cassette 1 in the direction of arrow b',
As shown in FIG. 11A, the small cassette guide 22
’ direction, and the cassette storage section 2 of the large cassette 1
0 in the direction of arrow b'.

When the large and small force centrifuge 1.2 is inserted into the cassette storage section 20 in the direction of the arrow b' in this manner, the rear end surfaces 1e and 2e of the large and small cassette 1.2 cause the feeding means 28 to move in the direction of the arrow a'. Pushed.

When the large and small cassettes 1.2 are inserted into the cassette storage portion 20 in the direction of arrow a' as shown by the dashed line and solid line in FIG. 9B, the ejecting means 27a, 27
b is moved in the direction of arrow h' and engaged with the front end surfaces 1d and 2d of the large and small cassettes 1.2.

After this, as shown in FIG. 9E, the ejecting means 28 is moved by the arrow g by the operator's eject operation means.
At the same time, the large and small cassettes 1.2 are automatically ejected from the cassette insertion opening 9 in the direction of the arrow a' by the ejecting means 27a and 27b.

By the way, as shown in FIG. 9B, this large and small cassette storage shelf 3 is provided with a pair of erroneous insertion detection rollers 70a and 70b, which are means for detecting erroneous insertion of the large and small cassettes 1.2. These erroneous insertion detection rollers 70a and 70b are located on one side 1b and 2 of the bottom surface 1f and 2f of the large and small cassettes 1.2.
By detecting the presence or absence of trapezoidal notches 71 and 72 formed on the b side, incorrect insertion of the large and small cassettes 1.2 is detected. Then, the erroneous insertion detection roller 7 of the large cassette 1
0a is a shelf board 19 that can freely appear and retract from an open lower 3a provided at a position biased toward the other inner side at approximately the center of the shelf board 19 in the longitudinal direction (arrow a, a direction). The erroneous insertion detection roller 70b of the small cassette 2 is provided at a position biased toward one inner wall 21a of the small cassette guide 22 at approximately the center of the shelf board 19 in the longitudinal direction (arrow aQ a' direction). It is configured to be able to freely appear and retract onto the shelf board 19 from the open lower door 3b.

As shown by a dashed line and a solid line in FIG. 9B, the large power center 1 and the small cassette 2 are inserted from the cassette insertion slot 9 between the pair of inner walls 21a and 22b in the cassette storage section 20, and between the inner wall 21a and the small cassette. When the large cassette 1 is inserted into the correct position between the guides 22 in the correct direction from the arrow a direction, each incorrect insertion detection roller 70a, 70b
．． The large and small cassettes 1.2 are correctly inserted into the respective notches 71 and 72 on the bottom surfaces 1f and 2f of the cassettes 1.2, and the correct insertion of the large and small cassettes 1.2 is detected.

On the other hand, when the large and small cassettes 1.2 are incorrectly inserted vertically or horizontally between the pair of inner walls 21a and 21b in the cassette storage section 20 or between the inner wall 21a and the small cassette guide 22, each error occurs. The insertion detection rollers 70a, 70b are unable to detect the notches 71, 72 of the large and small cassettes 1.2, and each of the incorrect insertion detection rollers 70a, 70b detects the opening from the lower opening 3a, 73b by the large and small cassettes 1.2. 19 is pushed down. And this large and small cassette 1.2
When erroneous insertion is detected, the locking operation of the ejecting means 27a and 27b is prohibited, and these ejecting means 27a
, 27b, the large and small cassettes 1.2 are immediately ejected from the cassette insertion opening 9 to the operator side 8, thereby making the operator aware that the large and small cassettes 1.2 have been inserted incorrectly.

G3 Next, the drive mechanism of the small cassette guide 22 will be explained with reference to FIGS. 6 to 8B.

The small cassette guide 22 in the form of a strip plate is molded of synthetic resin or the like, and a pair of front and rear arms 30 integrally molded on the opposite side of the guide surface 22a are attached to a pair of fulcrum shafts 23 on the shelf chassis 18. It is mounted rotatably in the directions of arrows e and e'.

A pair of ribs 31 having slopes 31a are integrally molded substantially vertically on the lower surfaces of the pair of arms 30. A lock plate 32 disposed on the shelf chassis 18 at the bottom of the pair of ribs 31 is attached to a pair of guide pins 33.
The small cassette guide 22 is guided by a pair of elongated holes 34 and is configured to be movable in directions of arrows a and a' parallel to the small cassette guide 22.

Furthermore, a rib 35 is provided on the lower surface of the front end surface of the small cassette guide 22.
is integrally molded almost vertically, and a lock plate 36 disposed on the shelf chassis 18 at the bottom of the rib 35 is guided by a guide pin 37 and an elongated hole 38 to form an arrow f perpendicular to the small cassette guide 22. , f' directions.

Next, the operation of the drive mechanism for this small cassette guide 22 will be explained.

First, as shown by the solid line in FIG.
is moved back in the direction of arrow a, and the long plate 36
When the is moved back in the direction of arrow f, as shown in FIG. 8A, the pair of ribs 31 ride on the lock plate 36 due to the guiding action of the slope 31a, and as shown in FIG. 7A, the small cassette guide 22 is rotated in the direction of arrow e, and this small cassette guide 22 is inserted into the elongated hole 25 of the shelf board 19.
is inserted outside the cassette storage section 20 from the 7th A.
As shown in the figure, the lock plate 36 is inserted into the lower part of the rib 35 from the direction of arrow f.

Next, as shown by the dashed line in FIG. 6, when the lock plate 32 is moved forward in the direction of arrow a' and the lock plate 36 is moved forward in the direction of arrow f', the state shown in FIG. 8B is as follows. As shown in FIG. 7B, the pair of ribs 31 fall into the pair of elongated holes 34, and the lock plate 36 escapes from the lower part of the rib 35 in the direction of arrow f' as shown in FIG. 7B. As shown in FIG.
It escapes to the outside (below the shelf board 19).

At this time, attach the small cassette guide 22 to a spring (not shown).
It may be rotated in the direction of the arrow e' by the arrow e'.

Therefore, in the state shown in FIG. 7A, even if only the lock plate 36 is moved forward in the direction of the arrow f' indicated by the dashed line, or
As shown in Figure B, even if only the lock plate 32 is moved forward in the direction of the arrow a', the small cassette guide 22 cannot be rotated in the direction of the arrow e', and the double-ended lock plate 32.
36 are both moved forward in the directions of arrows a and f', the small cassette guide 22 can be rotated in the direction of arrow e' and moved out of the cassette storage section 20.

G4 Next, the drive mechanism of the ejecting means 27a, 27b of the storage shelf 3 for large and small drawers will be explained with reference to FIGS. 2A to 2E.

First, Figure 2A shows the state before inserting the cassette.
A large cassette detection roller 24a is attached to the tip of the lever 40a, which is attached to the shelf chassis 18 via a fulcrum shaft 41a so as to be rotatable in the directions of arrows f and f'.The lever 40a is biased to rotate in the direction of arrow f by a spring 42a. has been done. Also, large force cent detection rollers 24b and 24c are attached to the tips of the rollers 24b and 24c, and the arrows f
, levers 40a, 4 rotatably mounted in the f' direction.
0b is connected to a pair of arms 43 integrally molded at both front and rear ends of the lock plate 32 via a pin 44 and a long hole 45, and the lock plate 32 is connected to the arrow a by a spring 42b.
By being biased forward in the direction, the pair of levers 40b
, 40c are urged to rotate in the direction of arrow f. Further, a slider 48, which is mounted on the shelf chassis 18 so as to be movable in the directions of arrows a and a' through a pair of guide bins 46 and a long hole 47, is actuated by a spring 49 serving as a double-movement biasing means.
A pair of ejecting means 27a and 27b are mounted on the slider 48, and a pair of fulcrum shafts 50 are mounted on the slider 48.
It is rotatably mounted in the directions of arrows , , and h' at the 10th AV centering on a and 50b. Further, a lock lever 51 is mounted on the shelf chassis 18 with arrows i and i' centered around a fulcrum shaft 52.
This lock lever is attached so that it can be rotated in the
The lock pin 53 attached to the tip of the slider 4
A pin 55 provided on this lock lever 51 is configured to be able to engage with a lock step 54 provided on the front end side of the lock lever 51.
is inserted into the long hole 38 of the lock plate 36.

In addition, a long hole 56 provided at the tip of the lock plate 36
A pin 57 provided on the lever 41a is inserted inside. Further, a slider 58 arranged to straddle the lock plate 32 is attached to the shelf chassis 18 through a pair of guide pins 59 and a long hole 60 so as to be movable in the directions of arrows f and f'. is urged to move in the direction of arrow f'. Then, the pin 62 provided on the slider 58 is brought close to the inclined portion 63 integrally formed on a part of the lock plate 32, and the arrow f,
The ejecting means 27b is arranged movably in the f' direction.
A control plate 64 for controlling the slider 58 is engaged with a pair of long holes 65 provided in the slider 58 by a pair of pins 66 . Note that the lock lever 51 is connected to the link 76 and the lever 7.
7 and is biased to rotate in the direction of arrow i by a spring 78. Further, a front panel 79 in which a cassette 7) insertion opening 9 is formed is configured to be detachable from the shelf chassis 18, and an eject button 80 is attached to the side of the cassette insertion opening 9 of this front panel 79. It is being

When the eject button 80 is pressed, the lever 77
The lock lever 51 is configured to be able to be rotated in the direction of arrow i' against a spring 78 via a link 76.

Next, the operation of the drive mechanism of the ejecting means 27a, 27b of this large and small cassette storage shelf 3 will be explained.

First, as shown in FIG. 2B, when the large cassette 1 is inserted into the cassette storage section 20 from the direction of arrow a, both cassette detection rollers 24a and 24b are released in the direction of arrow f', so both levers 40a and 40b are springs 42a and 4
2b in the direction of the arrow f', the lock plate 32 is moved forward in the direction of the arrow a', and the lock plate 36 is also moved forward in the direction of the arrow f' via the pin 57 and the elongated hole 56. Ru. Therefore, as shown in FIG. 7B, the small cassette guide 22 is released from the inside of the cassette storage section 20 in the direction of the arrow e'.

At this time, the pin 62 of the slider 58 is driven by the inclined portion 63 of the lock plate 32, which is moved forward in the direction of the arrow a', and the slider 58 is moved in the direction of the arrow f against the spring 61. The control plate 64 is moved in the direction of the arrow f through the hole 65 and the pin 66, and the ejecting means 27b is ejected from the inside of the cassette housing 20 in the direction of the arrow h', as shown in FIG. 10A.

Then, the front end surface 1d of the large cassette 1 inserted into the cassette storage section 20 in the direction of the arrow a pushes the ejecting means 27a in the direction of the arrow a, so that the slider 48 is moved forward in the direction of the arrow a against the spring 49. Ru.

The moment the large cassette 1 is inserted into the cassette storage section 20 to its proper position, the lock lever 51 is activated by the spring 4.
9 in the direction of arrow i, the lock pin 53 is engaged with the lock step 54 and locks the slider 48.

At this time, the pin 55 of the lock lever 51 moves to the end of the elongated hole 38 of the lock plate 36 in the direction of the arrow f', and thereafter, the lock plate 36 is held so as not to be moved back in the direction of the arrow f. By the lock lever 51 being rotated in the direction of arrow i, the delivery means 28 is rotated in the direction of arrow g and engaged with the rear end surface 1e of the large cassette 1, as shown in FIG. 10A.

Next, as shown in FIG. 2C, when the small cassette 2 is inserted into the cassette storage section 20 from the direction of the arrow a, the high force cent detection roller 24a is released in the direction of the arrow f', and is moved by the lever 40a. The lock plate 36 is indicated by the arrow f'
Although it is moved forward in the direction, the large cassette detection goler 24b
is not moved in any way, so the lock plate 32 is moved in the direction of arrow a.
It is not moved forward in the ' direction.

Therefore, the small cassette guide 22 is held inserted into the cassette storage section 20 as shown in FIG. 7A, and the small cassette 2 is held between one inner wall 21a and the small cassette guide
It can be inserted in the direction of arrow a at the normal position between.

Then, the front end surface 2d of the small cassette 2 inserted into the cassette storage section 20 in the direction of arrow a pushes the ejecting means 27b, and the slider 48 is moved forward in the direction of arrow a against the spring 49, and the lock lever 51 At the same time, the delivery means 28 is rotated in the direction of arrow g and engaged with the rear end surface 2e of the small cassette 2, as shown in FIG. 10A.

Next, as shown in FIG. 2B, when the large cassette 1 is returned from the cassette transfer device 6 into the cassette storage section 20 in the direction of arrow h', the lock plate 36 is moved in the direction of arrow f' by the lock lever 51. , the large cassette detection roller 24c is released in the direction of arrow f', and the lock plate 32 is moved forward in the direction of arrow a' by the lever 40c, so that the small cassette guide 22 moves forward in the direction of arrow a'. As shown in the figure, it is released from inside the cassette storage section 20 in the direction of arrow e'. The rear end surface 1e of the large cassette 1 inserted into the cassette storage portion 20 in the direction of the arrow
As shown in Fig. 0A, the sending means 28 is pushed in the direction of arrow a', and at the moment the large cassette 1 is inserted into the cassette storage section 20 to the proper position shown in Fig. 2B, as shown in Fig. 10A. The ejecting means 27a is rotated in the direction of the arrow and engaged with the front end surface 1d of the large cassette 1.

Next, as shown in FIG. 2C, when the small cassette 2 is returned from the cassette transfer device 6 into the cassette storage section 20 in the direction of arrow b', the small cassette 2 is 2 is the inner wall 21a and the small cassette guide 22
will be inserted at the regular position between. Then, the feeding means 28 is pushed in the direction of arrow a' by the rear end surface 2e of the small cassette 2 as shown in FIG. 10A, and the small cassette 2 is moved to the second
At the moment the ejector 27b is inserted into the proper position shown in the figure, the ejector 27b is rotated in the direction of the arrow and engaged with the front end surface 1d of the small force centrifuge 1, as shown in FIG. 10A.

Next, after the large and small cassettes 1.2 have been returned from the cassette transfer machine 6 into the cassette storage section 20 in this way, when the operator presses the eject button 80, as shown in FIGS. 2D and 2E, The opening lever 51 is rotated in the direction of arrow i' against the spring 49. Then, the 10th A
As shown in the figure, the delivery means 28 is released in the direction of arrow g', and the lock pin 53 is removed from the lock step 54 in the direction of arrow i', so that the long position of the slider 48 is released. Then, the slider 48 is moved back in the direction of arrow a' by the spring 49, and the ejecting means 2 on the slider 48 is
7a and 27b, the large and small cassettes 1.2 in the cassette storage section 20 are ejected from the cassette insertion opening 9 toward the operator side 8 in the direction of arrow a'.

G5 Next, the erroneous insertion detection mechanism of the large and small cassettes 1.2 will be explained with reference to FIGS. 1A to 5C.

As shown in FIGS. 1A to 1E, a pair of levers 82 and 83, each of which has a pair of erroneous insertion detection rollers 70a and 70b attached to one end, is mounted on the shelf chassis 18 via a pair of horizontal fulcrum shafts 85a and 85b. It is mounted so that it can rotate freely in the vertical directions of arrows j and j'. Note that another lever 84 is located at the end of the fulcrum shaft 85b on the lever 82 side, as shown by the arrow j.
, and is rotatably mounted in the j' direction. The pair of levers 82 and 83 are biased to rotate in the direction of arrow j by a pair of springs 86a and 86b, and the other lever 84 is biased to rotate in the opposite direction, in the direction of arrow j', by a spring 86c that is weaker than spring 86b. energized. The other end 83a of the lever 83 is brought into contact with a projection 84b provided at the end of an arm 84a integrally extending from the lever 84 toward the lever 83 from above. The lock plate 32 is disposed between the pair of levers 82 and 84 so as to be movable in the directions of arrows a and a'. 3
A protruding portion 88 having a slope 88a integrally formed on the top portion 2 is configured to be engageable from the direction of arrow a'. Further, a control plate 89 placed on the lock plate 32 is attached to the guide pin 32 of the lock plate 32 via an elongated hole 9o so as to be movable in the directions of arrows a and a.

A pair of protrusions 91a and 91b are formed downward at right angles on both sides of the control plate 89, and a pair of protrusions 92a are formed at right angles in the horizontal direction facing opposite ends of the pair of levers 82 and 83. 92b is configured to be engageable from the direction of arrow i'.

Note that, as shown in FIG. 2A, one end of the control plate 89 is an arm 51a extending integrally from the lock lever 51.
is rotatably connected to via a pin 93.

Next, the large and small cassettes 1 of this large and small cassette storage shelf.
The operation of the erroneous insertion detection mechanism No. 2 will be explained with reference to FIGS. 1A to 5B and 9A to 9E.

First, in the state before the cassette is inserted, as shown in FIG.
b protrudes above the shelf board 19 from the opening lower portions 3a and 73b. Further, since the other end 83a of the lever 83 presses the protrusion 84b from above, the lever 84 is also rotated in the direction of the arrow j.

Therefore, as shown in FIGS. 3A, 4A, and 9B, the operator inserts the large and small cassettes 1.2 into the cassette insertion slot 9.
If the cassette is inserted into the correct position in the cassette storage section 20 in the correct direction, the incorrect insertion detection roller 70a
, each notch 71.72 for large and small cassettes 1.2 on 70b.
In order to ensure correct positioning, the erroneous insertion detection roller 70
a, 70b are each notch 71.72 of large and small cassette 1.2
Detects the "presence" of.

That is, when the small cassette 2 is inserted correctly, the incorrect insertion detection roller 70b touches the bottom surface 2 of the small cassette 2, as shown in FIG. 1C.
5, once the spring 86 is moved in the direction of arrow f' as shown by the dashed line
Although it is pushed down against b, when it enters the notch 72, it returns in the direction of the arrow j, as shown by the solid line, and the presence of the notch 72 is detected. Then, when the lever 83 is rotated in the direction of the arrow j by the spring 86b,
The lever 84 is also rotated in the direction of arrow j as shown by the solid line via the projection 84b and arm 84a. Note that when the small cassette 2 is inserted correctly, the small cassette 2 does not come into contact with the incorrect insertion detection roller 70a at all.
0a remains rotated in the direction of arrow j by the spring 86a.

On the other hand, when the large cassette 1 is inserted normally, the large force cent detection roller 24b is first released in the direction of the arrow f' as shown in FIG. 2B, so the lock plate 32 moves in the direction of the arrow a' as described above. do. Then, as shown in FIG. 1B, the protrusion 88 of the lock plate 32 becomes
It enters the lower part of the bottle 87 from the direction of arrow a' while being guided by arrow a, and locks the lever 84 in the rotated state in the direction of arrow j.

Next, point the arrow a into the cassette storage section 20 of the large cassette 1.
With the correct insertion in the direction, as shown in FIG. 1B, the incorrect insertion detection roller 70a is once pushed down on the bottom surface 1f of the large force center 1 in the direction of the arrow j against the spring 86a as shown by the dashed line. However, when it enters the notch 71, it returns in the direction of the arrow j as shown by the solid line, and the notch 71 becomes "present".
Detect. Note that, as shown in FIG. 4C, the erroneous insertion detection roller 70b is pushed down against the spring 86b in the direction of the arrow j as shown by the solid line on the bottom surface 1f of the large cassette 1;
As shown in FIG. 1B, the lever 84 is already locked in the rotated state in the direction of arrow j as described above.

Therefore, when the large cassette 1 is correctly inserted, although the erroneous insertion detection roller 70b is pressed down, the lever 84 is rotated in the direction of arrow j in the same way as when the small cassette 2 is correctly inserted as shown in FIG. 1C. be in a state of being moved.

In this way, when the large and small cassettes 1.2 are inserted correctly, the lever 8
2.84 are both rotated in the direction of arrow j, and these protrusions 92a, 92b align with the protrusions 91a, 91 of the control plate 89.
It is in a state where it is released below b.

As a result, when the large and small cassettes 1 and 2 are inserted correctly, the 2B
As shown in the figure and FIG. 2C, the large and small cassettes 1.2 are inserted in the direction of the arrow a to the proper position, and the slider 4 is moved to the forward position against the spring 49 via the eject means 27a and 27b. When the lock lever 51 is moved forward, the spring 78 rotates the lock lever 51 in the direction of arrow i, and the lock pin 53
locked by And at this time, control plate 8
9 is a lever 82.8 as shown in FIGS. 3A and 5A.
It is moved in the direction of the arrow a' by the arm 51a of the rosochreha 51 without any contact with the protrusions 92a and 92b of 4.

Next, as shown in FIGS. 3B and 4B, if the operator mistakenly inserts the large and small cassettes 1.2 into the cassette/cassette storage section 20 through the cassette insertion slot 9 by erroneously turning the large and small cassettes 1.2 vertically or horizontally. In this case, since the erroneous insertion detection rollers 70a and 70b are pushed down by the large and small cassettes 1.2, the erroneous insertion detection rollers 70a and 70b detect that the notches 71 and 72 of the large and small cassettes 1.2 are "absent". .

That is, when the large cassette 1 is incorrectly inserted, the lever 84 is rotated in the direction of the arrow j by the protrusion 88 of the lock plate 32, which is moved in the direction of the arrow a', as described above, as shown in FIG. 1D. After being locked, the incorrect insertion detection roller 70
a and 70b are both pushed down by the large cassette 1 in the direction of the arrow j', and the lever 82 is rotated in the direction of the arrow j'.

On the other hand, when the small cassette 2 is incorrectly inserted, as shown in FIG. On the other hand, in order to escape in the direction of the arrow j', the lever 84 is rotated in the direction of the arrow j' by the spring 86c.

Therefore, when the large force centimeter 1.2 is incorrectly inserted, the lever 82.
84 are both rotated in the direction of arrow j', and these protrusions 92
a, 92b are inserted into the front positions (positions on the arrow a' direction side) of the protrusions 91a, 91b of the control plate 89, and prohibit subsequent movement of the control plate 89 in the arrow a' direction.

As a result, when the large and small cassettes 1 and 2 are inserted incorrectly, the 2D
As shown in FIG. 2 and FIG. 2E, even if the slider 48 is inserted in the direction of the arrow a to the normal position and moved forward to the forward position against the spring 49 via the eject means 27a and 27b, the control Plate 89 prohibits locking of slider 48 by lock lever 51.

That is, at this time, as shown in FIGS. 3B and 5B, the protrusions 92a and 92b of the levers 82 and 84 prohibit the control plate 89 from moving in the direction of the arrow a', so the lock lever 51 is It cannot be rotated in the direction of arrow i in Figures 2D and 2E.

Therefore, the ejecting means 27a, 27b cannot be locked in the forward movement position, and the large and small cassettes 1.2 that have been incorrectly inserted into the cassette storage section 20 are As shown in the figure, the return force of the spring 49 immediately ejected the cassette from the cassette insertion slot 9 toward the operator side 8 in the direction of arrow a' via the ejecting means 27a and 27b, and the large and small force cent 1.2 was inserted incorrectly. Make the operator aware of this.

As described above, according to the erroneous insertion detection mechanism for large and small cassettes 1.2, the pair of inner walls 21a in the cassette storage section 20
, 2Ib, and insert the large cassette 1 between the inner walls 21a of one side.
The small cassette 2 is inserted between the small cassette guide 22 and the large cassette 1.2, and the large and small cassettes 1.2 are inserted into different positions in the cassette storage section 20, and the bottom surface 1f of the inserted large and small cassette 1.2 is The positions of the notches 71 and 72 at 2f are also shifted from each other. Therefore, large and small cassette 1
．． Among a pair of erroneous insertion detection rollers 70a and 70b, which detect the presence or absence of notches 71 and 72 whose positions are shifted from each other,
The incorrect insertion detection roller 70b of the small cassette 2 is detected by the large cassette 1.
Even when inserted correctly, as shown in FIG. 4C, the bottom surface 1f of the large force socket 1 pushes down in the direction of the arrow j', resulting in an incorrect insertion detection state in which there is no notch.

However, as shown in FIG. 2B, by utilizing the detection operation of the large cassette detection roller 24b that detects the insertion of the large cassette 1, the lever 84 is rotated in the direction of arrow j, as shown in FIG. By locking, the ejecting means 27a can be locked in the forward movement position even though the erroneous insertion detection roller 7b of the small cassette 2 is in the erroneous insertion detection state. eject operation can be prohibited.

G6 Next, Figure 2F, Figure 2G, Figure 4D, and Figure 4E.
A means for switching the storage shelf 3 for storing large and small cassettes into a shelf exclusively for large and small cassettes will be explained with reference to the drawings.

With the shelf chassis 18, the other end 83 of the lever 83 moves the arrow a.
A switching means 96 is attached to a position on the ' direction side through a pair of guide pins 97 and a long hole 98 so as to be movable in the directions of arrows a and a'. It is dynamically energized.

When switching the storage shelf 3 for large and small cassettes to a shelf exclusively for large cassettes, one end 96a of the switching means 96 is connected to the spring 99 by a pin 100 attached to the back of the front panel 79.
4D and 1B, the other end 83a of the lever 83 is pushed in the direction of arrow a against the spring 86b. Push down in the j′ direction. Then, the erroneous insertion detection roller 70b of the small cassette 2 is locked in an open state in which the shelf board 19 is released from the lower part 3b in the direction of the arrow j'.

As a result, the storage shelf 3 for both large and small cassettes is switched to a shelf exclusively for large cassettes, so that the small cassette 2 is placed on this shelf exclusively for large cassettes by the arrow a, as shown in FIGS. 2F and 4D.
If the eject 27b is inserted from the direction indicated by arrow a, the eject 27b cannot be locked in the forward movement position, and the small cassette 2 is
It can be immediately ejected in the ′ direction.

As shown in FIGS. 2G and 2E, when the large cassette 1 is inserted into the large cassette dedicated shelf in the direction of arrow a, the ejecting means 21a can be locked in the forward movement position.

When returning this large cassette dedicated shelf to the original large and small cassette storage shelf 3, press pin 100 on the front panel 79.
When the switching means 96 is removed, the spring 99 causes the switching means 96 to move in the direction of the arrow a.
The small cassette 2 is moved back in the direction of arrow j and j', and the large cassette 80-ra 70b can be rotated in the directions of the arrows j and j' as before.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various friendly changes can be made based on the technical idea of the present invention.

H Effects of the Invention Claim 1 of the present invention is configured as described above, and in the storage rack for storing large and small cents selectively storing large and small cents in the cassette storage part, a large cassette is inserted. In some cases, even if the small cassette erroneous insertion detection means is in the erroneous insertion detection state, the large cassette is not ejected, so when the large and small cassettes are correctly inserted in different positions, the large and small cassettes are It can be stored correctly in the storage section.

The second aspect of the present invention is configured as described above, and the means for detecting the incorrect insertion of small cassettes in the storage rack for large and small cassettes can be easily switched to an inoperable state.
This storage shelf for large and small cassettes can also be used as a storage shelf exclusively for large and small cassettes.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and the drawings show an embodiment of the present invention.
Figures 1 to 1E are perspective views illustrating a mechanism for detecting incorrect insertion of large and small cassettes, and Figures 2A to 2G are perspective views of a storage shelf for large and small cassettes, illustrating the drive mechanism of the eject means and the means for switching to a shelf exclusively for large and small cassettes. Plan view, FIG. 3A is the I[A-IIIA arrow view of FIG. 2B, FIG. 3B is the I[ of FIG. 2D]
IB-I [IB arrow view, Figure 4A is IVA- in Figure 2C
IVA arrow view, Fig. 4B is a IVB-IVB arrow view of Fig. 2E, Fig. 4D is a TVD-TVD arrow view of Fig. 2F, Fig. 4E is an IVE-TVE arrow view of Fig. 2G, Figure 5A is a VA-VA arrow view of 2C, and Figure 5B is a V of Figure 2E.
B-V B arrow view, FIG. 6 is a plan view explaining the drive mechanism of the small cassette guide, FIG. 7 is a view from ■-■ arrow in FIG. 6, and FIG. 8 is a view from ■-■ in FIG. 6. Arrow view, Figures 9A to 9E
The figure is a plan view of a storage shelf for large and small cassettes to explain the small cassette guide and eject means, FIG. 10A is a view taken along the line XA-XA in FIG. 9B, and FIG.
B arrow view, FIG. 11A, and FIG. 11B are cross-sectional views of a storage shelf that serves both large and small cassettes to explain the small cassette guide.
The figure is a plan view of the entire cassette autochanger. In addition, in the codes used in the drawings, 1----------1----・---1--Dairy Senode 1f, 2f------1 Bottom surface 2-----, ---1 11, -Small cassette 3---
−−−−−− −・−Storage shelf 8 for large and small cassettes−−−
．． − Operator side 9 −−−1−−−Cuscent insertion slot 20 −−−−
---, ---, - one-cent storage section 21a, 21b
-------1 Inner wall 22----- Small cassette guide 24a, 2
4b, 24c ---1 Large force cent detection roller (large force cent detection means) 27 a, 27b ------- Eject means 4
9------------------ Spring (return biasing means) 51------- ----Lock lever (locking means) 70a,
70b ---, ---, --, Mis-insertion detection roller (Mis-insertion detection means) 71.72 ---... --- Notch 79 --- −−−−−−−−−−−−−−−−−・
-1------Front panel 89---------
---・・------ ---It is a switching means.

Claims (1)

[Scope of Claims] 1. In a storage shelf for storing large and small cassettes selectively in a cassette storage section, the cassettes are selectively inserted into different positions in the cassette storage section. a pair of eject means that are moved back and forth from a backward movement position to a forward movement position by a large cassette and a small cassette against a backward movement biasing means; and a locking means that locks the pair of ejection means in the forward movement position; Correct and incorrect insertion of large cassettes and small cassettes is detected by detecting the presence or absence of notches on the bottom surfaces of the large cassettes and small cassettes that are selectively inserted into different positions in the cassette storage section. a pair of erroneous insertion detection means that enables the locking operation of the locking means when correct insertion is detected and prohibits the locking operation of the locking means when erroneous insertion is detected; Large cassette detection means for detecting a cassette and enabling locking operation of the locking means even when the small cassette erroneous insertion detection means is in the erroneous insertion detection state. shelf. 2. In a large and small cassette storage shelf that selectively stores large and small cassettes in the cassette storage section, the large and small cassettes are selectively inserted into different positions in the cassette storage section. a pair of ejecting means that are moved back and forth from a backward movement position to a forward movement position by a mechanism that resists the backward movement biasing means; a locking means that locks the pair of ejection means in the forward movement position; and a locking means that locks the pair of ejection means in the forward movement position; Correct or incorrect insertion of the large cassette and small cassette is detected by detecting the presence or absence of a notch on the bottom of the large cassette and small cassette, which are selectively inserted into different positions. a pair of erroneous insertion detection means that enables the locking operation of the locking means when detected and prohibits the locking operation of the locking means when erroneous insertion is detected; and detecting a large cassette inserted into the cassette storage section; operated by a large cassette detection means that enables the locking operation of the locking means even when the small cassette erroneous insertion detection means is in the erroneous insertion detection state, and a front panel forming a cassette insertion opening of the cassette storage section; A storage shelf that can be used for both large and small cassettes, comprising a switching means for switching the small cassette erroneous insertion detection means to an inoperable state.